Add a rate limiting circuit breaker to the network controller to prevent flooding attacks and race conditions.

node/NetworkController.hpp

@@ -54,7 +54,8 @@ public:
 		NETCONF_QUERY_OK = 0,
 		NETCONF_QUERY_OBJECT_NOT_FOUND = 1,
 		NETCONF_QUERY_ACCESS_DENIED = 2,
-		NETCONF_QUERY_INTERNAL_SERVER_ERROR = 3
+		NETCONF_QUERY_INTERNAL_SERVER_ERROR = 3,
+		NETCONF_QUERY_IGNORE = 4
 	};
 
 	NetworkController() {}